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Wang C, Wu J, Yan B, Ni C, Ma X, Yang Z. N
‐coordinated Aluminum Complexes Catalyze the Hydrostannation of Alkynes. ChemistrySelect 2023. [DOI: 10.1002/slct.202204405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Chengzhi Wang
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Jin Wu
- Xi'an Aerospace Propulsion Test Technique Institute Xi'an 710100 P. R. China
| | - Ben Yan
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Congjian Ni
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Xiaoli Ma
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Zhi Yang
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
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2
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Guo S, Wong KC, Scheeff S, He Z, Chan WTK, Low KH, Chiu P. Copper-Catalyzed Reductive Ireland-Claisen Rearrangements of Propargylic Acrylates and Allylic Allenoates. J Org Chem 2021; 87:429-452. [PMID: 34918517 DOI: 10.1021/acs.joc.1c02455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The copper-catalyzed reductive Ireland-Claisen rearrangement of propargylic acrylates led to 3,4-allenoic acids. The use of silanes or pinacolborane as stoichiometric reducing agents and triethylphosphite as a ligand facilitated the divergent and complementary selectivity for the synthesis of diastereomeric anti- and syn-rearranged products, respectively. Copper-catalyzed reductive Ireland-Claisen rearrangement of allylic 2,3-allenoates proceeded effectively only when pinacolborane was used as a reductant to generate various 1,5-dienes in excellent yields and with good diastereoselectivities in some cases. Mechanistic studies showed that the silyl and boron enolates, rather than the copper enolate, underwent a stereospecific rearrangement via a chairlike transition state to afford the corresponding Claisen rearrangement products.
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Affiliation(s)
- Siyuan Guo
- Department of Chemistry and The State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Kong Ching Wong
- Department of Chemistry and The State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Stephan Scheeff
- Department of Chemistry and The State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Zhuo He
- Department of Chemistry and The State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Wesley Ting Kwok Chan
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P. R. China
| | - Kam-Hung Low
- Department of Chemistry and The State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Pauline Chiu
- Department of Chemistry and The State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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Shi Y, Wang J, Yin Q, Zhang X, Chiu P. Copper-Catalyzed Enantioselective 1,2-Reduction of Cycloalkenones. Org Lett 2021; 23:5658-5663. [PMID: 34255532 DOI: 10.1021/acs.orglett.1c01744] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We report an asymmetric 1,2-reduction of cyclic α,β-unsaturated ketones to access various enantiomerically enriched cyclic allylic alcohols under mild conditions, catalyzed by in situ generated copper hydride ligated with (R)-DTBM-C3*-TunePhos. α-Brominated cycloalkenones were reduced with excellent enantioselectivities of up to 98% ee, while substrates that were without α-substituents were reduced chemoselectively, with moderate enantioselectivities.
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Affiliation(s)
- Yongjie Shi
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China.,Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jingxin Wang
- Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qin Yin
- Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China.,Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518000, China
| | - Xumu Zhang
- Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Pauline Chiu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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Liu J, Song H, Wang T, Jia J, Tong QX, Tung CH, Wang W. Iron-Catalyzed Regiodivergent Hydrostannation of Alkynes: Intermediacy of Fe(IV)-H versus Fe(II)-Vinylidene. J Am Chem Soc 2020; 143:409-419. [PMID: 33371677 DOI: 10.1021/jacs.0c11448] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We report an iron system, Cp*Fe(1,2-R2PC6H4X), which controls the Markovnikov and anti-Markovnikov hydrostannation of alkynes by tuning the ionic metal-heteroatom bonds (Fe-X) reactivity. The sequential addition of nBu3SnH to the iron-amido catalyst (1, X = HN-, R = Ph) affords a distannyl Fe(IV)-H species responsible for syn-addition of the Sn-H bond across the C≡C bond to produce branched α-vinylstannanes. Activation of the C(sp)-H bond of alkynes by an iron-aryloxide catalyst (2, X = O-, R = Cy) affords an iron(II) vinylidene intermediate, allowing for gem-addition of the Sn-H to the terminal-carbon producing β-vinylstannanes. These catalytic reactions exhibit excellent regioselectivity and broad functional group compatibility and enable the large-scale synthesis of diverse vinylstannanes. Many new reactions have been established based on such a synthetic Fe-X platform to demonstrate that the initial step of the catalysis is conveniently controlled by the activation of either the tin hydride or the alkyne substrate.
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Affiliation(s)
- Jianguo Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Heng Song
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Tianlin Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Jiong Jia
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Qing-Xiao Tong
- Department of Chemistry, Shantou University, Shantou 515063, China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.,College of Chemistry, Beijing Normal University, Beijing 100875, China
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6
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Mandla KA, Moore CE, Rheingold AL, Figueroa JS. Regioselective Formation of (
E
)‐β‐Vinylstannanes with a Topologically Controlled Molybdenum‐Based Alkyne Hydrostannation Catalyst. Angew Chem Int Ed Engl 2018; 57:6853-6857. [DOI: 10.1002/anie.201802397] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Kyle A. Mandla
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
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7
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Mandla KA, Moore CE, Rheingold AL, Figueroa JS. Regioselective Formation of (
E
)‐β‐Vinylstannanes with a Topologically Controlled Molybdenum‐Based Alkyne Hydrostannation Catalyst. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802397] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kyle A. Mandla
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry Section of Synthesis, Materials and Chemical Biology University of California, San Diego 9500 Gilman Drive MC 0358 La Jolla CA 92093 USA
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8
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Korytiaková E, Thiel NO, Pape F, Teichert JF. Copper(i)-catalysed transfer hydrogenations with ammonia borane. Chem Commun (Camb) 2017; 53:732-735. [DOI: 10.1039/c6cc09067b] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly Z-selective alkyne transfer semihydrogenations and conjugate transfer hydrogenations of enoates can be effected by employing a readily available copper(i)/N-heterocyclic carbene (NHC) complex, [IPrCuOH], in combination with ammonia borane as a H2 equivalent.
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Affiliation(s)
- Eva Korytiaková
- Institut für Chemie
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Niklas O. Thiel
- Institut für Chemie
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Felix Pape
- Institut für Chemie
- Technische Universität Berlin
- 10623 Berlin
- Germany
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9
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Jordan AJ, Lalic G, Sadighi JP. Coinage Metal Hydrides: Synthesis, Characterization, and Reactivity. Chem Rev 2016; 116:8318-72. [PMID: 27454444 DOI: 10.1021/acs.chemrev.6b00366] [Citation(s) in RCA: 295] [Impact Index Per Article: 36.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Hydride complexes of copper, silver, and gold encompass a broad array of structures, and their distinctive reactivity has enabled dramatic recent advances in synthesis and catalysis. This Review summarizes the synthesis, characterization, and key stoichiometric reactions of isolable or observable coinage metal hydrides. It discusses catalytic processes in which coinage metal hydrides are known or probable intermediates, and presents mechanistic studies of selected catalytic reactions. The purpose of this Review is to convey how developments in coinage metal hydride chemistry have led to new organic transformations, and how developments in catalysis have in turn inspired the synthesis of reactive new complexes.
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Affiliation(s)
- Abraham J Jordan
- School of Chemistry & Biochemistry, Georgia Institute of Technology , 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Gojko Lalic
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | - Joseph P Sadighi
- School of Chemistry & Biochemistry, Georgia Institute of Technology , 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
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10
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Wong KC, Ng E, Wong WT, Chiu P. Copper Hydride Catalyzed Reductive Claisen Rearrangements. Chemistry 2016; 22:3709-12. [DOI: 10.1002/chem.201504870] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Indexed: 01/11/2023]
Affiliation(s)
- Kong Ching Wong
- State Key Laboratory of Synthetic Chemistry; Department of Chemistry; The University of Hong Kong; Pokfulam Road Hong Kong P. R. China
- Department of Pharmacology and Pharmacy; The University of Hong Kong; Pokfulam Road Hong Kong P. R. China
| | - Elvis Ng
- State Key Laboratory of Synthetic Chemistry; Department of Chemistry; The University of Hong Kong; Pokfulam Road Hong Kong P. R. China
| | - Wing-Tak Wong
- State Key Laboratory of Synthetic Chemistry; Department of Chemistry; The University of Hong Kong; Pokfulam Road Hong Kong P. R. China
- Department of Applied Biology and Chemical Technology; The Hong Kong Polytechnical University, Hung Hom; Hong Kong P. R. China
| | - Pauline Chiu
- State Key Laboratory of Synthetic Chemistry; Department of Chemistry; The University of Hong Kong; Pokfulam Road Hong Kong P. R. China
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11
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Vatansever EC, Kılıç K, Özer MS, Koza G, Menges N, Balci M. Intermolecular heterocyclization of alkynones with 2-mercaptoacetaldehyde under metal-free conditions: synthesis of 2,3-disubstituted thiophenes. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.07.090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Fujiwara S, Cadou R, Yamaoka Y, Takasu K, Yamada KI. Hydrostannylation-Cross-Coupling Strategy for the Stereoselective Synthesis of Alkylidenemalonates and Related α,β-Unsaturated Esters. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403429] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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13
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Zhu P, He X, Chen X, You Y, Yuan Y, Weng Z. Copper-mediated synthesis of α-trifluoromethylthio- and seleno-α,β-unsaturated carbonyl compounds. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.11.093] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Oger C, Balas L, Durand T, Galano JM. Are alkyne reductions chemo-, regio-, and stereoselective enough to provide pure (Z)-olefins in polyfunctionalized bioactive molecules? Chem Rev 2012. [PMID: 23194255 DOI: 10.1021/cr3001753] [Citation(s) in RCA: 251] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Camille Oger
- Institut des Biomolécules Max Mousseron, UMR CNRS 5247, Université Montpellier 1, Faculté de Pharmacie, 15 av. Charles Flahault, Bât. D, 34093 Montpellier Cedex 05, France
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15
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Atobe S, Masuno H, Sonoda M, Suzuki Y, Shinohara H, Shibata S, Ogawa A. Pd-catalyzed coupling reaction of acid chlorides with terminal alkynes using 1-(2-pyridylethynyl)-2-(2-thienylethynyl)benzene ligand. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.105] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Ou J, Wong WT, Chiu P. Reductive aldol cyclizations of unsaturated thioester derivatives of 1,3-cyclopentanedione catalyzed by chiral copper hydrides. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.07.057] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Ou J, Wong WT, Chiu P. Desymmetrizing reductive aldol cyclizations of enethioate derivatives of 1,3-diones catalyzed by a chiral copper hydride. Org Biomol Chem 2012; 10:5971-8. [DOI: 10.1039/c2ob25206f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Li N, Ou J, Miesch M, Chiu P. Conjugate reduction and reductive aldol cyclization of α,β-unsaturated thioesters catalyzed by (BDP)CuH. Org Biomol Chem 2011; 9:6143-7. [DOI: 10.1039/c1ob05352c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Bush AG, Jiang JL, Payne PR, Ogilvie WW. Development of a palladium catalyzed addition of boronic acids to alkynyl esters: synthesis of trisubstituted olefins as single isomers. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.08.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Noh D, Chea H, Ju J, Yun J. Highly Regio- and Enantioselective Copper-Catalyzed Hydroboration of Styrenes. Angew Chem Int Ed Engl 2009; 48:6062-4. [DOI: 10.1002/anie.200902015] [Citation(s) in RCA: 254] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Noh D, Chea H, Ju J, Yun J. Highly Regio- and Enantioselective Copper-Catalyzed Hydroboration of Styrenes. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902015] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Shi F, Tse MK, Cui X, Gördes D, Michalik D, Thurow K, Deng Y, Beller M. Copper-Catalyzed Alkylation of Sulfonamides with Alcohols. Angew Chem Int Ed Engl 2009; 48:5912-5. [PMID: 19582744 DOI: 10.1002/anie.200901510] [Citation(s) in RCA: 159] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Feng Shi
- Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, No.18, Tianshui Middle Road, 730000 Lanzhou, China.
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Shi F, Tse M, Cui X, Gördes D, Michalik D, Thurow K, Deng Y, Beller M. Copper-Catalyzed Alkylation of Sulfonamides with Alcohols. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901510] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cai M, Fang X, Dai R, Zha L. A one-pot, stereoselective synthesis of 2-ethoxycarbonyl-substituted 1,3-dienes and 1,3-enynes by hydrostannylation-Stille tandem reaction of tributyltin hydride with alkynyl esters and alkenyl or alkynyl halides. Appl Organomet Chem 2009. [DOI: 10.1002/aoc.1502] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Lipshutz B, Bošković Z, Aue D. Synthesis of Activated Alkenylboronates from Acetylenic Esters by CuH-Catalyzed 1,2-Addition/Transmetalation. Angew Chem Int Ed Engl 2008; 47:10183-6. [DOI: 10.1002/anie.200804912] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lipshutz B, Bošković Z, Aue D. Synthesis of Activated Alkenylboronates from Acetylenic Esters by CuH-Catalyzed 1,2-Addition/Transmetalation. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200804912] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Affiliation(s)
- Carl Deutsch
- Organic Chemistry II, Dortmund University of Technology, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
| | - Norbert Krause
- Organic Chemistry II, Dortmund University of Technology, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
| | - Bruce H. Lipshutz
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
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Regioselective hydrostannation of activated alkynes catalyzed by in situ generated copper hydride. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.04.085] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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30
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Rendler S, Oestreich M. Vom Schleifen eines “Rohdiamanten”: die “Cu-H”-Katalyse mit Silanen. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200602668] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Rendler S, Oestreich M. Polishing a Diamond in the Rough: “CuH” Catalysis with Silanes. Angew Chem Int Ed Engl 2007; 46:498-504. [PMID: 17072922 DOI: 10.1002/anie.200602668] [Citation(s) in RCA: 222] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The value of a novel chemical transformation is often underappreciated at the time of its discovery. The reasons are doubtlessly manifold, but the "chemical zeitgeist" subtly determines how the new reaction will be received by the chemical community. The enantioselective reduction of carbonyls by copper-catalyzed hydrosilylation was certainly outshone by other asymmetric hydrogenation techniques. A seminal report at an early stage indicated the considerable potential of this catalytic process, yet it was disregarded for more than a decade. A refined mechanistic picture in connection with a plethora of new chiral ligands then led to copper-catalyzed 1,2- as well as 1,4-reductions of carbonyl compounds with excellent levels of enantioselection at high substrate-to-catalyst ratios and even more remarkable substrate-to-ligand ratios. The tide is turning for inexpensive copper catalysts in asymmetric hydride transfer reactions!
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Affiliation(s)
- Sebastian Rendler
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
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Werner T, Barrett AGM. Simple Method for the Preparation of Esters from Grignard Reagents and Alkyl 1-Imidazolecarboxylates. J Org Chem 2006; 71:4302-4. [PMID: 16709075 DOI: 10.1021/jo060562m] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of Grignard reagents with alkyl imidazolecarboxylates, which were prepared from alcohols with carbonyl diimidazole, gave the corresponding esters in good to excellent yields. This method conveniently provides esters from alkyl halides and alcohols by C1-carbon chain extension.
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Affiliation(s)
- Thomas Werner
- Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, England
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